198487690867 has 2 divisors, whose sum is σ = 198487690868. Its totient is φ = 198487690866.

The previous prime is 198487690693. The next prime is 198487690871. The reversal of 198487690867 is 768096784891.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-198487690867 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 198487690867.

It is not a weakly prime, because it can be changed into another prime (198487696867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99243845433 + 99243845434.

It is an arithmetic number, because the mean of its divisors is an integer number (99243845434).

Almost surely, 2^198487690867 is an apocalyptic number.

198487690867 is a deficient number, since it is larger than the sum of its proper divisors (1).

198487690867 is an equidigital number, since it uses as much as digits as its factorization.

198487690867 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 292626432, while the sum is 73.

The spelling of 198487690867 in words is "one hundred ninety-eight billion, four hundred eighty-seven million, six hundred ninety thousand, eight hundred sixty-seven".